Record changing mechanism



y 22, 1952 H. c. HANSEN RECORD CHANGING MECHANISM 2 SHEETS-SHEET 1 Filed Aug. 8. 1947 lllllllli I' /I I ilEi lin 1 H H INVENTOR: Crzlsh'anflzmselq flares BY July 22, 1952 H. c. HANSEN RECORD CHANGING MECHANISM 2 SHEETSSHEET 2 Filed Aug. 8. 1947 INVENTOR: Hans Christian Hansel; BY

i LI L l' Patented July 22, 1952 RECORD CHANGING MECHANISM Hans Christian Hansen, Copenhagen, Denmark Application August 8, 1947, Serial No. 767,446 In Denmark November 28, 1942 Section 1, Public Law 690, August 8, 1946 Patent expires November 28, 1962 16 Claims.

This invention relates to magazine phonographs of the type in which a stack of records is supported above the turntable of the phonograph by a central guiding pin having movable primary supporting members adapted to carry the whole stack of records during reproduction from another record disposed upon the turntable, and secondary supporting members adapted to be introduced between the lowermost record of the stack and the record next thereto for supporting the stack when the primary supporting members are retracted into the guiding pin for permitting the lowermost record to descend along the guiding pin onto the turntable.

Certain practical difficulties have been experienced in such devices because of the varying thicknesses of the records. When the secondary supporting members are urged outwardly from the guiding pin to separate the lowermost record of the stack from the other records therein they must penetrate exactly into the very small space between these records since otherwise there will be risk of the records being damaged by the sharp edges of the secondary supporting members. It is the chief object of the present invention to avoid this difliculty.

According to the invention this is achieved by the provision of a central guiding pin, in or for phonographs of the type referred to, have primary and secondary supporting members for the purpose described, which are adapted to be automatically displaced relative to each other in the longitudinal direction of the guiding pin, during the record changing operation of the phonograph. By this measure the supporting members are allowed to adjust themselves in accordance with the thickness of the records so as to ensure that the secondary supporting members will not commence outward movement until they will have found the exact joint face between the records.

In carrying the invention into effect, the secondary supporting members may, during their movement relative to the primary supporting members be urged yieldingly outwards so as to engage the wall of the centre hole in the records and move along the same until the edge of the holes has been reached. Alternatively, provisions may be made for ensuring that the secondary supporting members will first be moved to the correct position in accordance with the thickness of the records, and then urged outwards.

To this effect the guiding pin may, in one embodiment of the invention, b off-set immediately above the primary supporting members in such a manner that the lowermost record of the stack supported on said members will assume an eccentric position with respect to the other records of the stack, and moreover the secondary supporting member or members is or are disposed at the projecting side of the upper, off-set portion of the guiding pin. When the secondary supporting member is moved downwards to adjust itself in accordance with the thickness of the lowermost record it will abut against the upper face of this record, the centre hole of which is not concentric with the centre holes of the other records, and thus be exactly positioned for separating the lowermost record from the other one.

This device will operate satisfactorily as long as the edges of the centre holes of the records are sharp and even, but if the said edges are chipped or rounded, difiiculties may arise by reason of the secondary supporting member abutting, not against the upper face of the lowermost record, but against a point of the rounded or chipped edge of the centre hole of the record which lies at a substantially lower level than the upper face of the record.

This difficulty may, however, be avoided by the provision of a feeler in slots in the guiding pin, which feeler is yieldably urged in an upward direction to abut against the lower face of the rec- 0rd eccentrically disposed upon the lowermost record and is adapted to constitute an abutment for the secondary supporting member to limit downward movement thereof.

The invention will now be described in greater detail, reference being had to the accompanying drawings, throughout which like characters denote similar parts of the various embodiments illustrated. Of these drawings:

Figure 1 is a sectional elevation of one form of a guiding pin for magazine phonograph in accordance with the invention, the primary supporting members being in their operative position and the secondary supporting members being retracted into the guiding pin,

Figure 2 is a similar view of the guiding pin with the primary supporting members retracted into the guiding pin for permitting the lowermost record of a stack to descend upon the turntable of the phonograph, the secondary supporting members being engaged beneath the next record of the stack,

Figure 3 is a sectional elevation of a modification,

Figure 4 is a corresponding view of an embodiment in which the guiding pin is off-set above the primary supporting members, and

Figures 5 and 6 are sectional views of a further modification, taken along two consecutive radial planes through the axis of the guiding pin, and

Figure 7 is a sectional new, taken on the secant line 'l-1 of Figure 5.

In Figure 1, numerals I, 2, 3 and 4 indicate four records supported upon a primary supporting member constituted by a series of sectors l2 extending through slots It in a guiding pin ii). A similar series of sectors 16, constituting the secondary supporting member, are provided above the sectors 2 for supporting during the record changing operation the record 2, lowermost but one of the stack and these sectors are adapted to project through the slots id. The sectors 16 are wedge-shaped and are provided with inclined faces [3 with which they engage the upper edges 20 of the slots 14 so as to be urged into the guiding pin l6 against the action of resilient members 22 on which the sectors are mounted, or with which they are integral. Thesprings 22 with the sectors may thus, for example, be constituted by a slotted portion of a bushing 2:1 which, with an internal flange 25, engages a shoulder 28 on a vertically slidable control rod 3% mounted within the hollow guiding pin.

The sectors it are formed with heels 32 extending towards the axis of the guiding pin which, when the control rod is in its upper position in which it holds the sectors it in their retracted positions, are received in a circumferential groove 33 in the control rod 30.

Adjacent the groove 35 the rod is conical as at 36 and this portion 36 is adapted to cooperate with the heels 32 to urge the sectors I6 radially outwards when the control rod 30 is moved downwardly.

A helical spring is inserted between the internal flange 26 of the bushing 24 and a shoulder 38 on the control rod 39 for resiliently urging the bushing downwardly when the control rod 3% is moved downwardly.

As soon as the inclined faces l8 of the sectors l6 are disengaged from the upper edges of the slots it by such downward movement of the bushing 24, the sectors 6 with their outer portions, project through the slots I4 under the action of the springs 22, and during further downward movement of the sectors they engage the wall of the centre hole of the record 2 and slide along the same until they reach the edge thereof,

when the wedge-shaped sectors, still under the action of the springs 22, engage their edges between the records land 2. The sectors cannot descend further, such movement being resisted by the record I, and the conical face 36 on the 7 rod 30 therefore, during further downward movement thereof urges the sectors 6 to the position shown in Figure 2 in which they are locked by the rod 3%, and in which they separate the records I and 2 from each other.

The sectors l2 of the primary supporting member are also mounted on or are integral with a bushing 42 part of which is slotted to constitute springs 44, and the sectors I2 are provided with heels 46. Beneath the bushing 42 the con trol rod 30 is formed with a flange 48 normally supporting the bushing. A spring 54 inserted between an internal flange 50 of the bushing and a shoulder 52 on the control rod urges the bushing resiliently against the flange 48. When the control rod is moved downwardly and the sectors is, in the manner described hereinbefore, engage the underside of the records 2, the spring 54 forces the bushing 42 downwardly with sufficient pressure to cause the sectors l2, now engaging the lower edge of the slots M with an inclined face 56, to be retracted into the guiding pin 10 so as to release the record i.

A helical spring 60 is inserted between the flange 48 on the control rod 36 and an internal flange 58 at the lower end of the guiding pin and serves to return the control rod to its upper position when the force pulling the control rod downwardly has ceased. The various parts then return to the position illustrated in Figure 1, the record 2 then taking the place of the record l.

The modification shown in Figure 3 differs from that shown in Figures 1 and 2 in that no spring is interposed between the control rod 38 and the bushing 2 and the bushing is loosely mounted on the control rod. The vertical displacement of the bushing in this instance is ensured simply by the face 36 of the control rod cooperating with the heels 32 of the sectors 16.

hi order to limit downward movement of the secondary supporting member and upward movement of the primary supporting member the slots l4 may be divided in two sections by means of a web 62.

In the form shown in Figure 3 the bushing 24 may suitably be closed by means of a screw cap 6a or the like.

In the modification shown in Figure l, the construction and operation of the primary supporting member is the same as that illustrated in Figures l3. The portion of the guiding pin situated above the primary supporting members 12, is however, off-set with respect to the lower position of the guiding pin in such a manner that the lowermost record I of the stack is eccentrically positioned with respect to the other records 2-4. Moreover the secondary supporting member is constituted by a single wedge-shaped sector or member 16 arranged at the projecting side of the upper off-set portion of the guiding pin. This sector, which is adapted to project through a slot 23a in the guiding pin, is integral with an L-shaped arm 22, which engages the upper end of the control rod 30 with its portion 26 and the lower end of which is formed with a heel 32 engaging an annular groove 34 of the control rod 30.

In operation, the member is will, during the first part of the downward movement of the control rod 38, descend therewith without making contact with the wall of the center hole of the record 2 and, consequently, without causing any wear thereon. However, when the lower side of the member it engages the free portion 38a of the upper side of the record I, the member is stopped in its downward movement, whereas the control rod 30 continues to descend. In this way the conical face 36 of the control rod forces the wedge-shaped member it to be inserted beneath the record 2 so as to separate it from the record i which is subsequently released in the manner described above. During this process the record 2 is also supported by the shoulder 8 on the guiding pin Ii It will be seen that the construction described with reference to Figure 4 will ensure correct engagement of the secondary supporting member between the records I and 2, even if the edges of the center holes of the records become slightly rounded in the course of time. Such Wear, on the other hand, would involve difiiculties in the case of the construction illustrated in Figures 1-3, since the secondary supporting member in that construction tends to descend to a point slightly below the level of the upper face of the blades 68.

lowermost record so that when forced outwards it might perhaps cause damage to the record.

In the construction shown in Figures 5, 6 and '7, a collar 84 is loosely mounted on the control rod 30. This collar is increased in diameter at its upper end and provided with an annular groove engaged by hook-shaped noses 66 formed on thin metal blades 68 loosely mounted in vertical slots I 4 in the guiding pin. The guiding pin is composed of an outer, lower, tubular part Illa. and an inner, upper part IUb in which the slots I4 are formed. The length of the part I8a is such that this part covers the slots I4 over part of their length so that the lower ends of the blades 68 are enclosed within the tubular part Illa. The blades 68 are formed with inclined portions I0 at their edges which engage the upper edge of the member I (la and permit them to assume an upwardly and outwardly inclined position with their upper ends projecting from the member IUb to support a stack of records I, 2, 3, 4. The inner edges of the blades are formed with projections 12 co-operating with the control rod 30 so as to prevent inward movement of the blades as long as the control rod is in the position shown in Figure 5.

When the collar 64 is moved in a downward direction, which is efiected by an internal flange 50 on the collar co-operating with a shoulder 52 on the control rod 30, the noses B6 on the blades are pulled downwardly, whereby the inclined edges ID of the blades cause the latter to collapse into the guiding pin so as to release the lowermost record I, the rod 30 having reduced diameter on part of its length permitting inward movement of the projections 12 of the blades (see Figure 1). The shoulder formed at the commencement of this length of reduced diameter, on the other hand, forces the blades outwards to the position shown in Figure 5, when the rod 38 is raised from its lower to its upper position.

On the collar 64 is loosely mounted another collar I4 which is urged upwardly by means of a helical spring 16 surrounding the collar 64 and supported by a spring ring I8 secured at the lower end of the collar 64. The collar 14 is formed with an annular groove 88 at its upper end which is engaged by hook-shaped noses 82 of further metal blade feelers 84 and 86 mounted in diametrically opposed slots 88 and 98, respectively, in the member IUb so as to be capable of vertical sliding movement. The upper portion of the member I0b, which with the parts mounted therein is generally similar to the construction described with reference to Figure 4, is off-set in such a manner that the plane defined by the axes of the relatively off-set portions of the guiding pin coincides, exactly or approximately, with the plane defined by the diametrically opposed blades 84 and 86. The blade 84 has such length that when the collar 14 is in its uppermost position with respect to the collar 64 and the latter is in the position shown in Figure 5, it will project above the shoulder 8 of the guiding pin and for more than the average thickness of a record above the level of the upper ends of the The blade 88 is of the same length as the blade 84 and is situated vertically underneath the secondary supporting member I8.

Thus, when a stack of records is disposed on the guiding pin the record 2 next to the lowermost record I supported by the blades 68 depresses the blade 84 and the collar 14 against the action of the spring 16, according to the thickness of the record I, and thereby adjust the blade 86 with the upper end thereof exactly at the level of the lower side of the record 2 (see Figure 6) When the control rod 38 is pulled downwardly to eifect release of the lowermost record I of the stack, the secondary supporting member I6 is lowered until it abuts against the upper end of the blade 86, when it is stopped in its .vertical movement and is engaged, at exactly the right place under the record 2, due to the action of the face 35 of the rod 38 on the heel 32, as described with reference to Figure 4.

With this construction the position of the secondary supporting member with respect to the records is determined only by the thickness of the records and not by the more or less irregular shape of the centre holes thereof. Thus, if the face 36a of the record I, which in the construction shown in Figure 4 defines the operative posititon of the member I6, is irregular, as indicated in Figure 6, the feeler blade 86 will, nevertheless, stop the member I6 exactly opposite the joint between the records I and 2.

Iclaim:

1. In a phonograph record changer, a vertical central guiding pin for a stack of records, retractable primary supporting means in said guiding pin for supporting said stack of records, secondary supporting means spaced more than the average thickness of a record above said primary supporting means and adapted to be introduced into the interstice between the lowermost record of said stack and the record next thereto, a control rod mounted for lengthwise sliding movement Within said guiding pin and connected with said primary supporting means to retract the same into said guiding pin, said secondary supporting means being releasably operable by said control rod to effect for a distance vertical move ment therewith abutment means operable to render ineffective said actuation by said control rod upon reaching a position in register with said interstice, and a cam face on said control rod adapted to exert lateral pressure to press said secondary supporting means into said interstice during continued movement of said control rod.

2. In a phonograph record changer, a vertical central guiding pin for a stack of records, retractable primary supporting means in said guiding pin for supporting said stack of records, secondary supporting means spaced more than the average thickness of a record above said primary supporting means and adapted to be introduced into the interstice between the lowermost record of said stack and the record next thereto, a control rod mounted for lengthwise sliding movement with said guiding pin and resiliently connected with said primary supporting means to retract the same into said guiding pin, said secondary supporting means being releasably operable by said control rod to effect for a distance vertical movement therewith abutment means operable to render ineffective said actuation by said control rod upon reaching a position in register with said interstice, and a cam face on said control rod adapted to exert lateral pressure to press said secondary supporting means into said inters-tice during continued movement of said control rod.

3. In a record changing mechanism, in combination, an elongated hollow and fixed center pin including a tubular wall having a plurality of apertures, primary record support and release means comprising, an element disposed On the interior of said pin and fioatingly suspended therein and movable axially in opposite directions between two extreme positions, at least one extension connected to said element and movable therewith axially and also movable transversally thereto, inwardly and outwardly, for projecting through an aperture to the exterior of said pin for record support, and returning to the pin interior for record release, respectively, cam and cam-follower means intermediate said pin and said extension for translating at least a portion of an axial movement of said element into a transverse inward movement of said extension, and a control member axially movable on the interior of said pin and including first means arranged to exert pressure onto said element for transmitting axial movement thereto and second means having a path of axial movement adjacent said extension and operable to press said extension outwardly and to release the same for return, respectively.

4. In a record changing mechanism, in combination, an elongated pin including a tubular wall surrounding a chamber and having apertures, primary record supporting means comprising an element axially movable within said chamber in opposite directions between two extreme positions, a plurality of supporting extensions associated with said element and axially movable therewith, each extension disposed in register with an aperture and movable outwardly from an inward rest position to protrude through the aperture for record support on the exterior of said pin, and having an inclined surface arranged to making sliding contact with an edge of the aperture during at least a portion of the axial movement of said element in one direction for returning said extension to the rest position for record release, control means axially movable in said pin independent of said primary means and operable to transmit axial movement in opposite directions to said element, said control means including a surface having a bevelled annular portion arranged to cooperate with said extensions for forcing the same outwardly during axial movement of said element in an opposite direction, and secondary supporting means associated with said pin and operable by said control means for supporting a stack of records above a record supported and subsequently released by said primary means.

5. In a record changing apparatus, in combination: an upright record centering tube having a plurality of slots; a primary support mechanism for record holding and release comprising a sleeve reciprocably movable in said tube, elements symmetrically arranged about the tube axis disposed in said slots and being connected to said sleeve and reciprocable therewith and oppositely movable transverse ofthe tube axis for spreading and contraction, respectively, and having outward and inward extensions, the former being biased for protruding-laterally-beyond the confines of said pin for record support; a control member reciprocable in said tube between two extreme positionsand comprising means for transmitting axial motion to; said sleeve; means for translating the movement of said sleeve in opposite axial directions into outward and inward movement, respectively, of said elements including an inclined surface on each outward extension and a corresponding surface on one wall edge of each slot for record releasing inward movement of said elements when said control mechanism and sleeve movein one axial direction, a surface on said control mechanism being at all times in abutment with said inward extensions and having a restricted area of clearance for said elements during said inward movement and a divergence adjoining said restricted area on said control mechanism for pressing said elements outwardly into lrecord supporting position when said control mechanism and sleeve move in opposite direction; and a secondary support mechanism actuable by said control mechanism to support records temporarily substantially during record release of said primary mechanism.

6. In a record changing apparatus, in combination, an upright record centering tube having a plurality of slots, primary record supporting and releasing means comprising a center piece reciprocable in said tube and elements connected thereto and movable therewith, each element disposed in a slot and movable transverse of the tube to and from a normally outwardly projecting position for record support and release, respectively, in response to opposite axial move ments of said center piece, and control means for actuating said center piece and translating the opposite axial movements thereof into opposite transverse movements of said elements and comprising, a member axially reciprocably movable in said tube relative to said center piece and including projections for transmitting axial movement in one direction to said center piece at a predetermined position of said member and of said center piece, and in an opposite direction at a second predetermined position, and interconnected surfaces on said member, including a convergence, in contact with said elements for pressing the same outwardly for record support prior to movement transmission to said center piece in said one direction and maintaining the same in outward position following said center piece movement, and releasing said elements for inward movement for record release prior to transmission of said center piece in an opposite axial direction, and means for moving said elements inwardly following release thereof by said control member.

7. In a record changing apparatus, in combination, an upright record centering tube having a plurality of slots, primary record supporting and releasing means comprising a center piece reciprocablc in said tube and elements connected thereto and movable therewith, each element disposed in a slot and movable transverse of the tube to and from a normally outwardly projecting position for record support and release, respectively, in response to opposite axial movements of said center piece, and control means for actuating said center piece and translating the opposite axial movements thereof into opposite transverse movements of said elements, comprising, a member axially reciprocably movable in said tube relative to said center piece and including projections for transmitting axial movement in one direction to said center piece at a predetermined position of said member and said center piece, and in an opposite direction at a second predetermined position, an outer and an inner axial surface and a bevelled interconnecting surface therebetween on said control member, said elements being substantially at all times in contact with at least one of said surfaces, said outer surface arranged to maintain said elements projecting outwardly for record support following the first named axial movement of said center piece, said inner surface arranged to clear said elements for inward positioning thereof following movement of said center piece in the other axial direction, said bevelled surface adapted to press said elements outwardly prior to the first named movement transmission, and means for moving said elements inwardly following release thereof by said control member.

8. In a record changing mechanism, in com bination,'an elongated hollow and fixed tubular record centering pin having lateral slots, a longitudinal control member disposed in said pin and forming with the tubular wall thereof an annular chamber, a primary and a secondary record support disposed in said chamber spaced from each other and each movable axially and independently of each other in opposite directions, said member reciprocable independently relative to said supports and operable to actuate each support for axial movement and stand still, respectively, at predetermined positions thereof relative to the other and for predetermined distances of movement, each support comprising at least one element movable with the support axially and movable transversal to the axis in opposite directions to be projected and retracted through said slot, respectively, and means for actuating said transverse movement including inclined surfaces on said member in contact with said projections, and a cam and cam-follower arrangement between each projection and an edge of said slot for engaging said projection, whereby the projection of a support will be pressed outwardly by said surface of said member in a predetermined position thereof relative to said support, and be pressed inwardly by said edge during an axial movement of the support, one inclined surface so disposed on said member and the movement of said member so arranged relative to that of said supports that the projection of the secondary support will be actuated by said surface for outward movement after it has been brought into alignment with the interstice between the two lowermost records.

9. In a record changing mechanism, in combination, a slotted tubular record centering pin including offset upper and lower portions and a curved connecting portion to guide the records, a control member extending throughout said portions on the interior of said pin and being reciprocably movable, a primary record support in said lower portion and actuable for record support and release, respectively, by said member, and a secondary record support in said upper portion disposed adjacent said member movable axially of said pin and comprising a projection and a feeler movable therewith, abutment means cooperating with said feeler to limit the movement of said secondary support in one direction and positioned for guiding said projection into alignment with the upper surface of the lowermost supported record, said projection arranged to be moved laterally of said pin through said slot along said record surface, and means inter" mediate said member and said secondary support for tying the axial movements for at least a fraction of the movement of the former and for actuating lateral movement of said extension upon axial movement limitation by said feeler.

10. In a record changing mechanism, as claimed in claim 4, together with, said tube including an offset portion for positioning the records of said stack slightly eccentrically with respect to the lowermost supported record, said secondary supporting means being disposed in said offset portion at the side thereof projecting laterally from said tube and being spaced more than the average thickness of a record above said primary supporting means and being vertically and transversely movable, and operable to engage the upper face of said lowermost record.

1 1 11. In a record changing mechanism, as claimed in claim 10, together with, a cam face on said control means adapted to exert lateral pressure to press said secondary supporting means along said upper face of said lowermost record into the interstice between said lowermost record and the record next above the same.

12. In a record changing mechanism, as claimed in claim 4, together with, said tube in cluding an offset portion for positioning the records of said stack eccentrically with respect to the lowermost record of said stack, said secondarysupporting means comprising an inverted L- shaped member mounted within said offset portion and loosely supported upon the upper end of said control means, a wedge-shaped lateral projection on said L-shaped member engaging a recess in the laterally projecting side of said offset portion, said L-shaped member being operable to move for a portion with said control means towards said lowermost record for abutment between said wedge-shaped projection and the upper face of said lowermost record, and acam face on said control means adapted to exert lateral pressure to press said wedge-shaped projection into the interstice between the lowermost record and the record next above the same, during continued movement of said control means.

13. In a record changing mechanism, as claimed in claim 4, together with, said tube including an offset portion for positioning the records of said stack eccentrically with respect to the lowermost record thereof, said secondary supporting means disposed in said offset portion at the side thereof projecting laterally from said tube and being spaced more than the average thickness of a record above said primary supporting means, yieldable feeling means in said tube for engaging the lower side of the record eccentrically positioned upon said lowermost record, an arm associated with said feeling means and disposed vertically below said secondary supporting means and having a free end in alignment with said feeling means, said control means operable for lowering said secondary supporting means against the free end of said arm for abutment to position said secondary supporting means in register with the interstice between the lowermost record and the record next above thereto and for subsequently introducing said secondary supporting means into said interstice.

14. In a record changing mechanism, as claimed in claim 13, in combination with, a cam face on said control means movable adjacent said secondary supporting means and operable to press the latter outwardly to introduce it into said interstice during continued control means movement.

15. In a record changing mechanism, as claimed in claim 4, together with, said tube including an offset portion for positioning the records of said stack slightly eccentrically with respect to the lowermost record thereof, said second supporting means comprising an inverted L-shaped member mounted within said offset portion and loosely supported upon the upper end of said control means, a wedge-shaped lateral projection on said L-shaped member engaging a recess in the laterally projecting side of said offset portion, yieldable feeling means in said tube for engaging the lower side of the record eccentrically positioned upon said lowermost record, an arm associated with said feeling means and disposed vertically below said wedge-shaped projection and having a free end in alignment with said feeling means, said L- shaped member being adapted to move vertically for a portion with said control means towards abutment between said wedge-shaped projection with the free end of said arm to position said projection in register with the interstice between said lowermost record and a record next above thereto, and a cam face on said control means movable adjacent said projection and arranged to press the same outwardly into said interstice during continued movement of said control means.

16. In a record changing apparatus, as claimed in claim 6, in combination with, said centering tube including offset upper and lower portions and a curved connecting portion whereby the lowermost record on the tube is laterally offset relative to an adjacent, second, record, said member extending throughout said portions on the interior of said tube, said primary record supporting means being positioned in said lower portion and including a gauge having a part arranged to abut against the under side of said second record and another part oppositethe upper tube portion and aligned with the first part, and secondary supporting means located in said upper portion and disposed adjacent said member and being movable axially of said tube and comprisinga projection and a feeler movable therewith, said feeler being operable to make abutment contact with said second part whereby it will limit the movement of said secondary supporting means in one direction for guiding said projection into alignment with the upper surface of the lowermost record, said projection being arranged to be moved laterally of said tube through a slot along said record surface.

HANS CHRISTIAN HANSEN.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 314,795 Cables Mar. 31, 1885 1,438,000 Underhill Dec. 5, 1922 2,287,098 Habegger June 23, 1942 2,307,031 Erwood Jan. 5, 1943 FOREIGN PATENTS Number Country Date 62,695 Denmark Sept. 18, 1944 64,649 Denmark July 22, 1946 

